The following warning is not fixed:
(gnome-calendar:8477): Gtk-WARNING **: Could not load a pixbuf from /org/gtk/libgtk/theme/Adwaita/assets/bullet-symbolic.svg.
This may indicate that pixbuf loaders or the mime database could not be found.

Adding gdk-pixbuf[0] as input doesn't seem to fix the issue. Anyway, there seems no
issue so far.

[0] https://lists.gnu.org/archive/html/guix-devel/2016-11/msg00704.html

Thanks